But nothing could prepare anyone for what was to come.
Just when the Roar looked to have locked in another extra-time grand final nailbiter, Berisha threatened in front of goal only to air swing before falling to the ground.
Somehow Gillett saw a foul on Berisha, who proceeded to convert the matchwinner from the penalty spot as the majority of the packed Suncorp Stadium went nuts for a second straight season.
Albanian international Berisha had equalled the season record tally of 19 goals in 2011-12 before the final - but there were no prizes for guessing which one he cherished the most in his first season with Brisbane.
It was a cruel fate for Perth who at one stage looked set to become the first team since Sydney FC in the 2009-10 season to win an away A-League final.
Indeed at one stage they looked set to cap a remarkable season turnaround after at one stage crashing from second to second-last following just one win in 12 games in 2011-12.
The Glory still looked solid despite having Dean Heffernan sent off in the 93rd minute.
It may be a fitting farewell for Roar coach Ange Postecoglou after he was linked to a lucrative move to Melbourne Victory next season.
-AAP